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OPERATING SEGMENTS - Long Lived Assets by Geographic Areas (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [line items]    
Non-current assets $ 719,139 $ 721,956
Canada    
Disclosure of geographical areas [line items]    
Non-current assets 348,455 372,389
United States    
Disclosure of geographical areas [line items]    
Non-current assets 224,612 256,184
Argentina    
Disclosure of geographical areas [line items]    
Non-current assets 79,250 26,008
Mexico    
Disclosure of geographical areas [line items]    
Non-current assets 66,131 66,561
Other    
Disclosure of geographical areas [line items]    
Non-current assets $ 691 $ 814